aftermarket headunit and sub wiring?
im trying to install a kenwood excelon headunit in my 2001 focus. the stock head unit has three plug in the back, the new head unit has 1. i have no idea what adapters i need or what i need to do to make it work. also, im installing a 500watt rms 15 inch sub in the trunk. whats the best path to run the wires?